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What is the molar mass of 35 g of an unknown substance that depresses the freezing point of .350 kg of water .50°C? Kf for water is 1.86C/m.
Consider an area-source box model for air pollution above a peninsula of land. the length of the box is 15 km, its width is 80 km, and a radiation inversion restricts mixing to 15 m.
Identify three radioactive elements or reactions of different types and write the nuclear reaction for each element.
If 329 g water at 65.7°C loses 9730 J of heat, what is the final temperature of the water?
What is the pH of a solution that has a formic acid (HCHO2) concentration of 0.39 and a potassium formate (KCHO2) concentration of 0.12? The Ka for formic acid is 1.7 x 10-4.
What functional group is present in glucose? Is glucose a reducing or nonreducing carbohydrate?
A sample of nitrogen has a volume of 630 mL at a temperature of 49 degC. Assuming that the pressure is constant, what will be the volume when the temperature is 348.6 degC.
A student found that her mixture was 15% NH4Cl, 20% NACL, and 75% SiO2. Assuming her calculations are correct, what did she most likely do incorrectly in her experiment?
Imidazole is a weak acid, and thus reacts with strong bases to form the corresponding anion. Show this reaction, and draw resonance structures that account for the stability of conjugate base.
if 100 mL of 0.100 M NaCl is added to 100 mL of .01 M NaCl, what is the concentration of Na ions in the final solution?"
A chemist wants to make 5.5L of a 0.280M CaCl2 solution.What mass of CaCl2 (in g ) should the chemist use
If a solution containing 17.76 g of mercury(II) perchlorate is allowed to react completely with a solution containing 5.102 g of sodium sulfate, how many grams of solid precipitate will be formed.
The solubility of N2 in blood at 37 oC and at a partial pressure of 0.80 atm is 5.6 X 10-4 mol/L. A deep-sea diver breathes compressed air with the partial pressure of N2 equal to 3.1 atm. Assume that the total volume of the blood in the body is 5..
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